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一、編碼范圍

1. GBK (GB2312/GB18030)
x00-xff GBK雙字節編碼范圍
x20-x7f ASCII
xa1-xff 中文
x80-xff 中文

2. UTF-8 (Unicode)
u4e00-u9fa5 (中文)
x3130-x318F (韓文
xAC00-xD7A3 (韓文)
u0800-u4e00 (日文)
ps: 韓文是大于[u9fa5]的字符

正則例子:
preg_replace("/([x80-xff])/","",$str);
preg_replace("/([u4e00-u9fa5])/","",$str);

二、代碼例子

//判斷內容里有沒有中文-GBK (PHP)
function check_is_chinese($s){
    return preg_match('/[x80-xff]./', $s);
}

//獲取字符串長度-GBK (PHP)
function gb_strlen($str){
    $count = 0;
    for($i=0; $i<strlen($str); $i++){
        $s = substr($str, $i, 1);
        if (preg_match("/[x80-xff]/", $s)) ++$i;
        ++$count;
    }
    return $count;
}

//截取字符串字串-GBK (PHP)
function gb_substr($str, $len){
    $count = 0;
    for($i=0; $i<strlen($str); $i++){
        if($count == $len) break;
        if(preg_match("/[x80-xff]/", substr($str, $i, 1))) ++$i;
        ++$count;
    }
    return substr($str, 0, $i);
}

//統計字符串長度-UTF8 (PHP)
function utf8_strlen($str) {
    $count = 0;
    for($i = 0; $i < strlen($str); $i++){
        $value = ord($str[$i]);
        if($value > 127) {
            $count++;
            if($value >= 192 && $value <= 223) $i++;
            elseif($value >= 224 && $value <= 239) $i = $i + 2;
            elseif($value >= 240 && $value <= 247) $i = $i + 3;
            else die('Not a UTF-8 compatible string');
        }
        $count++;
    }
    return $count;
}

//截取字符串-UTF8(PHP)
function utf8_substr($str,$position,$length){
    $start_position = strlen($str);
    $start_byte = 0;
    $end_position = strlen($str);
    $count = 0;
    for($i = 0; $i < strlen($str); $i++){
        if($count >= $position && $start_position > $i){
            $start_position = $i;
            $start_byte = $count;
        }
        if(($count-$start_byte)>=$length) {
            $end_position = $i;
            break;
        }
        $value = ord($str[$i]);
        if($value > 127){
            $count++;
            if($value >= 192 && $value <= 223) $i++;
            elseif($value >= 224 && $value <= 239) $i = $i + 2;
            elseif($value >= 240 && $value <= 247) $i = $i + 3;
            else die('Not a UTF-8 compatible string');
        }
        $count++;

    }
    return(substr($str,$start_position,$end_position-$start_position));
}

//字符串長度統計-UTF8 [中文3個字節，俄文、韓文占2個字節，字母占1個字節] (Ruby)
def utf8_string_length(str)
    temp = CGI::unescape(str)
    i = 0;
    j = 0;
    temp.length.times{|t|
        if temp[t] < 127
            i += 1
        elseif temp[t] >= 127 and temp[t] < 224
            j += 1
            if 0 == (j % 2)
                i += 2
                j = 0
            end
        else
            j += 1
            if 0 == (j % 3)
                i +=2
                j = 0
            end
        end
    }
    return i
}

//判斷是否是有韓文-UTF-8 (javascript)
function checkKoreaChar(str) {
    for(i=0; i<str.length; i++) {
        if(((str.charCodeAt(i) > 0x3130 && str.charCodeAt(i) < 0x318F) || (str.charCodeAt(i) >= 0xAC00 && str.charCodeAt(i) <= 0xD7A3))) {
            return true;
        }
    }
    return false;
}

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